<?php

$array = array(
  'name'=>'php',
  'php'=>'version',
  'version'=>'five',
  'lang'=>'',
  'framework'=>NULL
);

$a = isset($array['lang']);
//var_dump($a);

$b = array_key_exists('lang',$array);
//var_dump($b);

$aa = isset($array['framework']);
var_dump($aa);

$bb = array_key_exists('framework',$array);
//var_dump($bb);



